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Investments in associates (Narrative) (Details) - CAD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Oct. 13, 2022
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement [Line Items]          
Proceeds from euity interests     $ 0 $ 0 $ 152
Share-based compensation expense     1,013 1,059 1,206
Dolly Varden [Member]          
Statement [Line Items]          
Common shares sold 17,000,000        
Proceeds from euity interests $ 6,800        
Investment in shares classified as an asset held for sale   17,000,000      
Impairment expense   $ 5,506 5,506    
Fair market value     51,769 53,554  
Percentage of voting equity interests acquired 22.20%        
UMS [Member]          
Statement [Line Items]          
Outstanding balance     103 240  
Future Rental Expense     381    
Share-based compensation expense     $ 317 $ 483 $ 453